05-22-2015 05:09 PM
Actually, that example you posted from Weitze (attached here) is the "classic" type, and I think that L/56 mark is actually in relief. There's no finish remaining on the numerals compared with the surrounding surface so there's a bit of an optical illusion making it appear like the mark is stamped in. It's a heavily worn example and I'm not sure if the remaining gilding we see there is original, but it doesn't look like a fake.
Weird how it looks almost stamped in those photos. I stand corrected though.